Genetic Variation in Pigeonpea Germplasm

Germplasm ia the raw material for crop improvement and its utility depends upon the naaful mmtic divardty it eontainr (bornaha 1984

Pigeonpea collection in Luzon, Philippines

Pigeonpea is not one of the major field crops of the Philippines. The cultivation is limited to small gardens around the house and field bunds. Most of the produce is consumed by the growers and hence seldom found in the market..

Seed viability of pigeon pea stored in two environments.

Pigeonpea cv. ICP-1, -26, -2624, -6443 and -6997 were stored at 15-20 deg C and RH and compared with ambient room conditions at ICRISAT. After 4 yr in cool storage the viability of all cv. except ICP-6997 remained >92%. At room temp. ICP-6997 lost viability completely, ICP-2624 maintained 53% viability and ICP-26, -1 and -6443 germinated 44, 24 and 4%, resp. Plastic bottles were the best containers at ambient room temp. and in cool storage no difference was detected between them and paper and cloth bags. (Abstract retrieved from CAB Abstracts by CABI’s permission

Pigeonpea Collection in Attappadi Hills and Atylosia Collection in Silent Valley South India

The Attappadi Hills are know for pigeonpea of good quality for "dal". The ICRISAT gene bank had no substantial representation from the area. During the present mission the entire pigeonpea growing area of this region was covered which resulted in securing a richly varied representative collection. In total, 39 samples were collected, some from adjoining areas, and field observations were made. Pigeonpeas of the Attappadi Hills are late indeterminate cvs with mostly large white seeds. There in considerable variability in seed color pattern and pod characteristics. Many of them high potential for the "vegetable type" pigeonpea breeding and utilisatio

Pigeonpea collection in Indonesia, July-August, 1990

The world collection of pigeonpea germplasm maintained at ICRISAT has only 12 accessions from Indonesia. The crop has been under cultivation in the islands of Indonesia for the last several centuries. Therefore, Indonesia was identified as one of the priority regions for pigeonpea germplasm collection

Resistance to Meloidogyne javanica and Rotylenchulus reniformis in Wild Relatives of Pigeonpea

Meloidogynejavanica and Rotylenchulu4 reniformis are important nematode pests of pigeonpea. Greenhouse evaluation of 66 accessions of 25 species of Cajanus, Rhynchosia, and Flemingia for resistance to M. javanica based on number and size of galls, galled area of root, and number of egg masses showed resistance to be available in these wild relatives of pigeonpea. Thirty-five accessions had ~<10 galls. Five accessions of C. scarabaeoides (ICPW 92, 101, 103, 128, and 133) had very small or no galls. Damage indices (based on gall number, gall size, and galled area of root) ranged between 1 and 8 on a 1 (highly resistant) to 9 (highly susceptible) scale. ICPW 92 was highly resistant to M. javanica, and 38 other accessions were resistant. Accessions of Flemingia spp. and Rhynchosia spp. showed greater susceptibility than accessions of Cajanus spp. Based on the number of egg masses on roots, no accession of the three genera was highly resistant to R. reniformis, and 83% of the tested accessions were susceptible. Two accessions of C. scarabaeoides (ICPW 38 and 92) and one accession each of R. aurea (ICPW 210), R. minima (ICPW 237), and R. rotMi (ICPW 257) were resistant to R. reniformis. Species of Cajanus and Flemingia were generally more susceptible to R. reniformis than were Rhynchosia spp. ICPW 92 was identified as a promising genotype with genes for resistance to both nematodes

Reaction of Pigeonpea Cultivars and Germplasm Accessions to the Root-knot Nematode, Meloidogyne javanica

Meloidogynejavanica is an important nematode pest of pigeonpea. Thirty-four pigeonpea cuhivars and 227 germplasm accessions were evaluated for resistance to M. javanica based on number of galls, egg masses, size of galls, and area of root covered with galls. Galls were not formed on 75% of the cuhivars, and no egg masses were observed on the roots of four cuhivars (UPAS 120, Pant A3, CO 1, and BDN 2); however, shoot mass of 64% of the cuhivars was reduced by M.javanica. Pant A3, ANM 504, and BDN 2 were identified as highly resistant to M. javanica. Plant weight of these cultivars was not reduced (P = 0.05) in the nematode-infested soil. Cuhivars with low gall and egg mass ratings and significantly reduced vegetative biomass in nematode-infested soil were considered to have low tolerance to the nematode. Galls and egg masses were found on all the germplasm accessions; galls were usually more common than egg masses. None of the germplasm accessions were resistant to M. javanica, but 33 accessions were moderately resistant. Large variations in gall number, gall size, and egg mass number were observed. ICP 24 and ICP 99, two moderately resistant accessions, manifested low plant-to-plant variation